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What is the difference between persist() and merge() in JPA and Hibernate?
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JPA specification contains a very precise description of semantics of these operations, better than in javadoc:
The semantics of the persist
operation, applied to an entity X are
as follows:
If X is a new entity, it
becomes managed. The e...
Understanding CUDA grid dimensions, block dimensions and threads organization (simple explanation) [
How are threads organized to be executed by a GPU?
2 Answers
2
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Are tuples more efficient than lists in Python?
Is there any performance difference between tuples and lists when it comes to instantiation and retrieval of elements?
8 A...
Recursive lambda functions in C++11
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Think about the difference between the auto version and the fully specified type version. The auto keyword infers its type from whatever it's initialized with, but what you're initializing it with needs to know what its type is (in this case, the lambda closure needs to know the types it...
Drop data frame columns by name
...ike to remove from a data frame. I know that we can delete them individually using something like:
20 Answers
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#define macro for debug printing in C?
Trying to create a macro which can be used for print debug messages when DEBUG is defined, like the following pseudo code:
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Python: how to print range a-z?
...mn'
>>> string.ascii_lowercase[:14:2]
'acegikm'
To do the urls, you could use something like this
[i + j for i, j in zip(list_of_urls, string.ascii_lowercase[:14])]
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Why does ('0' ? 'a' : 'b') behave different than ('0' == true ? 'a' : 'b') [duplicate]
Why is the result of the following two statements different?
6 Answers
6
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Is it possible to adjust x,y position for titleLabel of UIButton?
Is it possible to adjust the x,y position for the titleLabel of a UIButton ?
4 Answers
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Is there a Unix utility to prepend timestamps to stdin?
I ended up writing a quick little script for this in Python, but I was wondering if there was a utility you could feed text into which would prepend each line with some text -- in my specific case, a timestamp. Ideally, the use would be something like:
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